高功率DPSL声光调Q脉宽压窄的影响因素研究

利用调Q速率方程,从工作物质的增益和谐振腔的损耗之间的内在关系出发,论述了谐振腔内多个可变参数对激光器输出脉冲宽度的影响。用实验给予了验证。在实验中,采用高效的光耦合泵浦腔,对35个20W连续激光二极管阵列侧面泵浦的声光调Q Nd∶YAG固体激光器进行了研究,激光工作物质的尺寸为Φ4mm×115mm,使用熔石英声光Q开关,在泵浦电流I=22.2A时,获得了重复频率10kHz,脉冲宽度45.8ns,平均功率112W的1064nm调Q激光脉冲输出。光-光转换效率为21.3%,电-光转换效率为8.5%。

Influence factors on pulsewidth reduction of high power AO Q-switching DPSL

Using Q-Switching rate equation,from the viewpoint of internal relations between the gain of active medium and the loss of resonator,the influence the multiparameters of resonator on pulsewidth are explicated.The theoretical prediction is validated through experiments.In the experiment,high efficient optical coupling and pumping cavity are adopted.AO Q-switched diode-side-pumped Nd:YAG laser is developed.The laser is pumped by 35×20W CW diode arrays.The size of active medium is Φ4mm×115mm.By using fused quartz crystal for AO Q-switching,at pumping current I=22.2A.A Q-Switching pulse of 45.8ns FWHM and 246kW peak power at 1064nm with 10kHz repetition rate are acquired.The opticalto-optical conversion efficiency and the electrical-to-optical conversion efficiency are 21.3% and 8.5% respectively.